Heat transfer coefficient

General discussion about Elmer

Heat transfer coefficient

Postby payam » 29 Sep 2017, 14:13

Hello,
I am trying to use the elmer fem for thermal analysis of electrical machine . I have some problems in the boundary definition the Heat transfer coefficient means the natural our force convection coefficient plus radiation?if it is not correct how can I calculate this element ?
payam
 
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Joined: 20 Sep 2017, 11:37

Re: Heat transfer coefficient

Postby mzenker » 29 Sep 2017, 14:21

Hi,

the heat transfer coefficient can include conduction and convection. The radiation can be taken in to account separately.
I would suggest that you read the corresponding chapter in the Elmer Models manual.

Matthias
mzenker
 
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Location: Germany

Re: Heat transfer coefficient

Postby payam » 29 Sep 2017, 14:32

For calculation of convection coefficient --I usually use the dimensionless numbers and calculated base some empirical correlations .
here I have to make this calculation and then put the number in sif ?
Do you have any example about calculation of this factor for Elmer ?
payam
 
Posts: 13
Joined: 20 Sep 2017, 11:37

Re: Heat transfer coefficient

Postby mzenker » 29 Sep 2017, 14:34

payam wrote:For calculation of convection coefficient --i usually use the dimension less number and calculated base some empirical correlations .
here oi have to make this calculation and then put the number in sif ?

Yes.
payam wrote:Do you have any example about calculation of this factor for Elmer ?

No, it depends on your geometry and how accurately you want to determine this coefficient.

Matthias
mzenker
 
Posts: 1593
Joined: 07 Dec 2009, 11:49
Location: Germany


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